9873981 has 20 divisors (see below), whose sum is σ = 15886332. Its totient is φ = 6075648.

The previous prime is 9873979. The next prime is 9874003. The reversal of 9873981 is 1893789.

It can be written as a sum of positive squares in 2 ways, for example, as 1265625 + 8608356 = 1125^2 + 2934^2 .

It is not a de Polignac number, because 9873981 - 2¹ = 9873979 is a prime.

It is a super-2 number, since 2×9873981² = 194991001576722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9873911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3636 + ... + 5741.

Almost surely, 2^9873981 is an apocalyptic number.

It is an amenable number.

9873981 is a deficient number, since it is larger than the sum of its proper divisors (6012351).

9873981 is a wasteful number, since it uses less digits than its factorization.

9873981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9402 (or 9393 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 9873981 is about 3142.2891337367. The cubic root of 9873981 is about 214.5346415761.

The spelling of 9873981 in words is "nine million, eight hundred seventy-three thousand, nine hundred eighty-one".